Door-alarm



(ModeL) 2 Sheets-Sheet 1.

W. G. DUPEU 8c. 0. J. FUCHS. DOOR ALARM. No. 366,655. Patented July 19,1887.

N Hans, Pnon'um n m. Wnhingmm D c.

( Model.) 2 Sheets-Sheet 2.

W. O. DUFEU 8v. 0. J. FUCHS.

DOO'R ALARM. No. 366,655.

IX 6 0 "F50 i -WM Patented July 19,1887.

. i a u 0% UNITED STATES PATENT OFFICE.

\VALTER O. DUFEU AND OSCAR J. FUCHS, OF OHILLICOTHE, OIIIO.

DOOR-ALARM.

SPECIFICATION forming part of Letters Patent No. 366,655, i ted July 19, 1887.

Application filedJunc 30,1886. Serial No. 206,69. (Model.) I

To all whom, it may concern:

Be it known that we, VAT/DER O. DUFEU and Osolut J. Focus, citizens of the United States, residing at Chillicothe, in the county of Ross and State of Ohio, have invented certain new and useful Improvements in Alarms; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to certain new and useful improvements in alarms for door-knobs, the same being designed either as a substitute for the ordinary summoningbell or as a burglaralarm to indicate a felonious attempt at entrance.

Referring to the accompanying drawings, illustrative of our invention, Figure 1 represents a front elevation of a portion of the inside of a door provided with our invention.

Fig. 2 is a like view, the door-knob and alarmgong being removed to better illustrate the construction of the parts. Fig. 3 is a section of the alarm mechanism upon the line 3 3 of Fig. 1. Fig. 4 is a section upon the line 4 4. of Fig. 1; and Figs. 5, 6, and 7 are large detail views of different parts of the device.

Similar letters of reference indicate similar parts throughout the several views.

A indicates a door provided with the mortise-lock or other lock B, said lock having the usual latch and door-knobs, O O, as shown. An arched plate, E, having a central perforation to admit the passage of the knobshank D, is secured to the door-panel, and bears at its center the gong F, to which it is secured by the rivets f.

It will be understood that the perforations of the piece E and the gong F are sufficiently large to permit of the revolution of the knobshank within them. Below the knob-shank is secured to the door-panel a plate, G having mounted thereon a stud, II. Upon this stud are mounted the gong-hammers I I, consisting, respectively, of pieces of stout wire pro vided at their outer ends with striking-heads, and having the bends J J, within which rest the opposite ends of the band-spring K, secured in the slot of a stud, K, at the lower end of the plate G. Intermediate between the two hammers there is mounted upon the stud H a sleeve-tappet, L, having a projecting arm. In the patlrot' this arm, and upon either side thereof, is located a projection, in m, extending from the. strikirig-hammers. Studs N N limit the outward movement of the striking-hammers. Upon thckuob-shank is keyed the oscillating finger 0, having at its lower end the projections o and at its upper end the projection P.

To the plate G are secured the oppositely coiled springs GG", said springs being bent so as to extend over opposite sides of the projection P, but not being rigidly attached to said projection. To one ofthe fasteninglugs of the arched plate E is rigidly connected a springcatch, It, provided with two recesses, r r. A lever, S, is pivoted to the plate G at s, and is of such shape as to strike against the bends J J of the hammers and raise them to the position shown in Fig. 2 in full lines, when it is desired to throw the device out of action.

The parts being constructed'as described, the operation of our invention is as follows: \Vhen the lever S is in the lower not-ch, 'r, of the catch R, a turn of the knob-shank D to either the right or the left will cause either one or the other of the projections of the finger O, as the case may be, to strike the projecting arm of the sleeve-tappet L. This tappet will therefore be revolved partially upon the stud H, and during said partial revolution will revolve one of the hammers I I. It will continue to raise said hammer in opposition to the retractile force of the spring K until the projection of the finger is past the projecting arm of the tappct,whereupon the hammer and tappet will be released and the spring K will cause the hammer to strike the inside of the gong, thereby causing the latter to sound. Upon releasing the knob the finger-piece will be restored to its original position, and at the same time the other hammer will be caused to strike the gong. \Vhen it is desired for any reason to throw the device out of action, it is merely necessary to raise. the lever S until it engages the notch r of the spring catch It. The effect of this operation is to prevent the hammers from striking the inside of the gong.

Having thus described our invention, what we claim, and desire to secure by Letters Patent, is

1. In an alarm for door-knobs, the combi- ICO nation of the knob-shank D, the finger-piece O, secured thereto, and having the projections 0' 0 and extension I, the springs G G the striking-hammers I I, having projections m' m, and the intermediate tappet-sleeve, L, having an arm in the same plane as said projec tions, the stud H, upon which the said hammers and sleeve are mounted, the spring K,

, fixed centrally and having its free ends bearstrikin hammers I I havin coils or bends J J and projections m m, the tappet-sleeve L,

intermediate between the hammers and having an arm in the same plane as the projections m m, the stud H, upon which the hammers and sleeve are mounted, the spring K, fixed centrally and having its free ends bearing against the bends or coils J J, the pivoted bent lever S, bearing against the under surface of said bends or coils J J, the spring-piece R, having the catches r r, and the gong F, sub stantially as shown and described.

In testimony whereof we affix our signatures in presence of two witnesses.

WALTER G. DUFEU. OSCAR J. FUCHS.

Witnesses:

SAMUEL J. BRIGGS, HIRAM STREITIDNBERGER. 

